#! /bin/bash
export LANG=en_US.UTF-8

#WARNLIMIT=-1 		#警告值 超过该值则认为是需要告警
#ERRORLIMIT=-1 		#错误值 超过该值认为是错误

FLAGE=
FLAGEID=
#是否输出FLAGPID
FLAGEOPID=1
#是否输出RUNTIME
RUNTIME=1
#是否输出STARTTIME
STARTTIME=0
CONN=0				#是否检查连接数
CONNMIN=
CONNMAX=

Reading=0				#是否检查连接数
ReadingMIN=
ReadingMAX=
Writing=0				#是否检查连接数
WritingMIN=
WritingMAX=
Waiting=0				#是否检查连接数
WaitingMIN=
WaitingMAX=


MEMORY=0			#是否检查内存
MEMORYMIN=
MEMORYMAX=
CPU=0				#是否检查CPU
CPUMIN=
CPUMAX=

CURNUM=				#当前的性能参数

WranResultStr=		#最后形成的告警字符串
ErrorResultStr=		#最后形成的错误字符串
DataResultStr=		#性能呢个参数字符串

NGINXSTA=

PORT=
quota=
QUOTASTR=

function gotErr(){
	if [ "$1" -eq 0 ];then
		echo "mailstatedes=各项指标恢复正常 statedes=各项指标恢复正常|$DataResultStr"
	elif [ "$1" -eq 1 ];then 
		echo "quota=${quota} mailstatedes=$WranResultStr statedes=$WranResultStr ${QUOTASTR} |$DataResultStr"
	elif [ "$1" -eq 2 ];then 
		if [[ "${WranResultStr}" != "" ]]; then
			echo "quota=${quota} mailstatedes=${WranResultStr},${ErrorResultStr} statedes=${WranResultStr},${ErrorResultStr} ${QUOTASTR}|$DataResultStr"
		else
			echo "quota=${quota} mailstatedes=${ErrorResultStr} statedes=${ErrorResultStr} ${QUOTASTR}|$DataResultStr"
		fi
		
	elif [ "$1" -eq 3 ];then 
		echo "mailstatedes=无法获取到指标,疑似组件故障,请确认并请检查监控脚本和运维平台配置 statedes=无法获取到指标,疑似组件故障,请确认并请检查监控脚本和运维平台配置|$DataResultStr"
	fi

	exit $1
}

#返回是否服务是否存活
function isAlive(){
	#ps aux | grep nginx | grep process | wc -l
	isAliveStr=$(ps aux | grep nginx | grep process | wc -l)

	if [[ "$isAliveStr" -lt 2 ]];then
		gotErr 3
	fi
	FLAGEID=$(netstat -lnp | grep :$PORT |grep nginx |awk '{print $NF}' | awk -F '/' '{print $1}')
}

#处理连接数
function getConnNum(){
	# CURNUM=$(netstat -natp|grep nginx | wc -l)
	rm -rf nginx-status
	rm -rf check_nginx_temp
	wget $NGINXSTA -O nginx-status -o check_nginx_temp
	#CURNUM=$(head -n 1 nginx-status | awk -F ':' '{print $2} ' | awk 'gsub(/^ *| *$/,"")')
	
	CURNUM=$(netstat -nat|grep -i "80"|wc -l)
}
#ps -eo pid,etime 是查询进程运行时间
function getRuntime(){
	CURNUM=$(ps -eo pid,etime | grep $FLAGEID |awk '{if($1=='$FLAGEID') print $2}')
}

#ps -eo pid,lstart是查询进程的开始时间
function getStarttime(){
	CURNUM=$(ps -eo pid,lstart | grep $FLAGEID |awk '{if($1=='$FLAGEID') print $2 ,$3 ,$4 ,$5 ,$6}')
}

function getReading(){
	CURNUM=$(tail -n 1 nginx-status | awk -F ' ' '{print $2} ' | awk 'gsub(/^ *| *$/,"")')
	if [[ CURNUM=='' ]];then
		CURNUM=0
	fi
}

function getWriting(){
	CURNUM=$(tail -n 1 nginx-status | awk -F ' ' '{print $4} ' | awk 'gsub(/^ *| *$/,"")')
	if [[ CURNUM=='' ]];then
		CURNUM=0
	fi
}


function getWaiting(){
	CURNUM=$(tail -n 1 nginx-status | awk -F ' ' '{print $6} ' | awk 'gsub(/^ *| *$/,"")')
	if [[ CURNUM=='' ]];then
		CURNUM=0
	fi
}


#ps aux 4是内存 累加4的值
function getMemory(){
	CURNUM=$(ps aux | grep nginx|grep process|awk 'BEGIN{sum=0}{sum+=$4}END{print sum}')
}

#ps aux 3是CPU 累加3的值
function getCPU(){
	CURNUM=$(ps aux | grep nginx|grep process|awk 'BEGIN{sum=0}{sum+=$3}END{print sum}')
}

#依据传入的参数值来判断我们要监控的服务是什么
#然后通过各个函数获取到具体的值
#值之间的
function analysisStat(){

	if [ "$FLAGEOPID" -eq 1 ];then
		CURNUM=$FLAGEID
		parseFileds "FLAGEPID" $CURNUM $CURNUM
	fi
	if [ "$RUNTIME" -eq 1 ];then
		getRuntime
		parseTimeFileds "RUNTIME" $RUNTIME $RUNTIME		
	fi
	
	if [ "$CONN" -eq 1 ];then
		getConnNum
		parseFileds "ConnectionNum" $CONNMIN $CONNMAX
	fi

	if [ "$Reading" -eq 1 ];then
		getReading
		parseFileds "Reading" $ReadingMIN $ReadingMAX
	fi

	if [ "$Writing" -eq 1 ];then
		getWriting
		parseFileds "Writing" $WritingMIN $WritingMAX
	fi

	if [ "$Waiting" -eq 1 ];then
		getWaiting
		parseFileds "Waiting" $WaitingMIN $WaitingMAX
	fi

	if [ "$MEMORY" -eq 1 ];then
		getMemory
		parseFileds "Memory" $MEMORYMIN $MEMORYMAX
	fi
	if [ "$CPU" -eq 1 ];then
		getCPU
		parseFileds "CPU" $CPUMIN $CPUMAX
	fi
	

	if [ "$STARTTIME" -eq 1 ];then
		getStarttime
		parseTimeFileds "STARTTIME" $STARTTIME $STARTTIME		
	fi
	
	
}
function parseTimeFileds(){
	val1=$(echo "$CURNUM $2")
	val2=$(echo "$CURNUM $3")
  DataResultStr="$DataResultStr $1=$CURNUM;$2;$3;0;0"
}

#CURNUM			当前值
#WARNLIMIT 		告警的上限
#ERRORLIMIT 	异常的上限
#判断以上三个值并拼接结果字符串
function parseFileds(){
	val1=$(echo "$CURNUM $2"| awk '{if($1<=$2){print 1}else{print 0}}')
	val2=$(echo "$CURNUM $3"| awk '{if($1<=$2){print 1}else{print 0}}')

	DataResultStr="$DataResultStr $1=$CURNUM;$2;$3;0;0"
	if [ $val1 -eq 1 ];then
		return 0
	elif [[ $val1 -eq 0 && $val2 -eq 1 ]];then
		if [[ ${WranResultStr} != "" ]]; then
			WranResultStr="${WranResultStr},"
		fi

		WranResultStr="${WranResultStr}$1当前值为${CURNUM}超过告警值${2}"

		if [[ ${quota} != "" ]]; then
			quota="${quota},"
		fi

		quota="${quota}$1"

		QUOTASTR="${QUOTASTR}$1=$1当前值为${CURNUM}超过告警值${2} "

		return 1
	else
		if [[ ${ErrorResultStr} != "" ]]; then
			ErrorResultStr="${ErrorResultStr},"
		fi
		ErrorResultStr="${ErrorResultStr}$1当前值为${CURNUM}超过紧急值${3}"

		if [[ ${quota} != "" ]]; then
			quota="${quota},"
		fi

		quota="${quota}$1"

		QUOTASTR="${QUOTASTR}$1=$1当前值为${CURNUM}超过紧急值${3} "
		
		return 2
	fi
}

#分析结果 给出给出状态
function analysisResult(){
	if [[ "$WranResultStr" == "" && "$ErrorResultStr" == "" ]];then
		gotErr 0
	elif [[ "$ErrorResultStr" == "" ]];then
		gotErr 1
	else
		gotErr 2
	fi
}

#输出错误信息并且退出程序
function showHelp(){
	if [ "$1" != "" ];then
		echo "请输入$1"
	fi
	echo "check_naginx.sh 可以监听本地的nginx的状态 参数如下"
	echo "check_naginx.sh [-w 连接数,CPU,内存] [-c 连接数,CPU,内存] [-p <<port>>] [-l <http://<<ip>>/iflyweb_status>]"
	echo "-w 表示监控警告的值"
	echo "-c 表示异常值"
	echo "-p 表示nginx-status的端口"
	echo "-l 表示nginx-status的地址"
	exit 1
}


#检查参数是不是数字
function isNumber(){
	isNum=$(echo "$1" | awk '{print($0~/^([0-9])+[\.]?([0-9])?$/)?1:0}')
	return $isNum
}

function isLarge(){

	isNumber $1
	if [[ $? -eq 0 ]]; then
		return 1
	fi

	isNumber $2
	if [[ $? -eq 0 ]]; then
		return 1
	fi

	isLarge=$(echo "$1 $2"| awk '{if($1>=$2){print 1}else{print 0}}')
	if [ $isLarge -eq 1 ];then
		return 0
	else
		return 1
	fi
}

function checkARG(){
	if [[ "$2" != "" && "$3" != "" ]];then
		isLarge "$3" "$2"
		if [[ $? -eq 1 ]]; then
			return 1
		else
			$1=1
		fi
	fi
	return 0
}

#检查参数是否合法
#即参数是否是小数和整数
#对于守护进程的选择 这个值可以不验证
function checkALL(){
	if [[ "$CONNMIN" != "" || "$CONNMAX" != "" ]];then
		if [[ "$CONNMAX" == "" || "$CONNMIN" == "" ]]; then
			return 1
		fi

		isLarge "$CONNMAX" "$CONNMIN"
		if [[ $? -eq 1 ]]; then
			return 1
		else
			CONN=1
		fi
	fi
	if [[ "$CPUMIN" != "" || "$CPUMAX" != "" ]];then
		if [[ "$CPUMAX" == "" || "$CPUMIN" == "" ]]; then
			return 1
		fi

		isLarge "$CPUMAX" "$CPUMIN"
		if [[ $? -eq 1 ]]; then
			return 1
		else
			CPU=1
		fi
	fi
	if [[ "$MEMORYMIN" != "" || "$MEMORYMAX" != "" ]];then

		if [[ "$MEMORYMAX" == "" || "$MEMORYMIN" == "" ]]; then
			return 1
		fi

		isLarge "$MEMORYMAX" "$MEMORYMIN"
		if [[ $? -eq 1 ]]; then
			return 1
		else
			MEMORY=1
		fi
	fi


	if [[ "$ReadingMIN" != "" || "$ReadingMAX" != "" ]];then

		if [[ "$ReadingMAX" == "" || "$ReadingMIN" == "" ]]; then
			return 1
		fi

		isLarge "$ReadingMAX" "$ReadingMIN"
		if [[ $? -eq 1 ]]; then
			return 1
		else
			Reading=1
		fi
	fi


	if [[ "$WritingMIN" != "" || "$WritingMAX" != "" ]];then

		if [[ "$WritingMAX" == "" || "$WritingMIN" == "" ]]; then
			return 1
		fi

		isLarge "$WritingMAX" "$WritingMIN"
		if [[ $? -eq 1 ]]; then
			return 1
		else
			Writing=1
		fi
	fi


	if [[ "$WaitingMIN" != "" || "$WaitingMAX" != "" ]];then

		if [[ "$WaitingMAX" == "" || "$WaitingMIN" == "" ]]; then
			return 1
		fi

		isLarge "$WaitingMAX" "$WaitingMIN"
		if [[ $? -eq 1 ]]; then
			return 1
		else
			Waiting=1
		fi
	fi


	return 0
}

function parseARG(){
	#it mean warning
	if [ $1 -eq 1 ];then
 		CONNMIN=$(echo $2 | awk -F ',' '{print $1}' | sed "s/[^0-9]//g")
 		CPUMIN=$(echo $2 | awk -F ',' '{print $2}' | sed "s/[^0-9]//g")
 		MEMORYMIN=$(echo $2 | awk -F ',' '{print $3}' | sed "s/[^0-9]//g")
 		ReadingMIN=$(echo $2 | awk -F ',' '{print $4}' | sed "s/[^0-9]//g")
 		WritingMIN=$(echo $2 | awk -F ',' '{print $5}' | sed "s/[^0-9]//g")
 		WaitingMIN=$(echo $2 | awk -F ',' '{print $6}' | sed "s/[^0-9]//g")
 	else
 		CONNMAX=$(echo $2 | awk -F ',' '{print $1}' | sed "s/[^0-9]//g")
 		CPUMAX=$(echo $2 | awk -F ',' '{print $2}' | sed "s/[^0-9]//g")
 		MEMORYMAX=$(echo $2 | awk -F ',' '{print $3}' | sed "s/[^0-9]//g")
 		ReadingMAX=$(echo $2 | awk -F ',' '{print $4}' | sed "s/[^0-9]//g")
 		WritingMAX=$(echo $2 | awk -F ',' '{print $5}' | sed "s/[^0-9]//g")
 		WaitingMAX=$(echo $2 | awk -F ',' '{print $6}' | sed "s/[^0-9]//g")
 	fi
}

while getopts "w:c:p:h:l" arg
do
	case $arg in
		w)
			parseARG 1 "$OPTARG"
			;;
		c)
			parseARG 2 "$OPTARG"
			;;
		p)
			PORT="$OPTARG"
			;;
		l)
			NGINXSTA="$OPTARG"
			;;			
		h)
			showHelp
			;;
		?) 
			showHelp
			;;
	esac
done

checkALL
if [[ $? == 1 ]];then
	showHelp "正确参数"
fi


#插件正题部分 
#确定存活的
#启动
#分析


isAlive
analysisStat
analysisResult
